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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac907f04a7217338e5453067b03041400b522c542436b25c7a0db125ffae501' 
  AND token = '4xeb/iBlpQZvAJGtMqD7bxtp1MmGfg65cK/Qb+Gib8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}